Step 2: Building the Grow Bed

Start by building two 8'x2'x8'' grow boxes with the 2''x4''s and plywood for the base. Line the entire inside with pond liner and fill with the pea gravel. Mount the beds on the 4''x4'' posts with the carriage bolts and position them on top of each other with easy access to both and ample spaces between them for plants to trellis and mature. DO NOT MOUNT THE BEDS FLAT. The beds must be mounted on angles (around 5 deg. from flat) to allow for the water to flow down them and back into the fish tank. The top bed should be higher towards the fish-food tanks; and the lower bed should be lower towards the fish tank.

Cut a hole in the bottom of the top bed (on the end that is angled down) for the 1'' PVC pipe to allow for the water to flow from the top bed to the bottom bed. Cut another hole in the side (although at the bottom) of the bottom bed for the 1'' PVC pipe to allow for the water to flow back into the fish tank.
<p>This is fascinating -- as far as it goes, but leaves us asking a lot of questions as you see by the other comments below (some of which are four years old and still unanswered).</p><p>My questions would be: Since your setup is indoors, how do you get enough light to grow vegetables and the duckweed and algae to raise the fish? </p><p>How much food can this system produce? Is this just a curiosity or could one actually make a serious dent in the food bills with a similar setup?</p>
do i need a heater to keep the fish water warm in winter?
I looked up rock bass online and it said that they are carnivorous... Are the fish in your system doing okay only eating the duckweed and snails from the tanks above?
If you grow tilapia and you run your system where the water is light green, not dark green mind you, and have the water at the conditions where they can survive. Theyll thrive well just on algae and nothing else, I believe the instructables said not to use carnivorous fish, you can but youll have to have a different set up where your also growing food for the fish such as smaller fishes. But why do that when you can use tilapia that can thrive only on algae. IF your state doesnt allow tilapia without a license. Then you can try feeder fish such as minnow and pan fish that thrive on plant matter. That way you can eat the pan fish or use them and the minnows for live bait. But to let you know nothing can grow as fast as tilapia till market size thats a herbivore, and simple to take care of.
looks great... i have a couple of white drums like that and was considering using them as they were with a lid on top - couple of questions;<br>-- dont quite get what you mean by having to cut a hole out of the fish tank to &quot; allow oxidation&quot; ? <br>--i am assuming only the bottom tank has fish in it&gt;<br>-- what do you feed the fish&gt;<br><br>cheers
How many Rock Bass do you put in the lower tank? Do you start with more fingerlings and then thin them out as they get bigger?
&nbsp;2 thumbs up!
Really nice - thanks for sharing.<br />

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